3 years ago

Fill in the blank so that 81x2+_ x+81 is a perfect square trinomial. 81x²+_____ x+81

1 answer:

6 0

the blank is 162

since 81 and 81 are both perfect squares the middle term (blank) will be the product of their roots times 2

√81=9

√81 =9

9 x 9 x 2

= 162

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